Ken Armstrong is a fighter pilot in the RAF. Freshly promoted to Squadron Leader, his life is about to get far more dangerous. Armstrong’s days of photo-reconnaissance are over. Called to Fighter Command HQ, Armstrong receives exciting new orders: Form a special squadron to take the war to the enemy. This secret squadron must sneak into enemy territory to destroy German bombers in France and the Low countries. This ‘intruder’ work, carried out mostly at night, is difficult and dangerous, for the pilots must fly Bristol Blenheim fighters — which are no match for the German Messerschmitts. Until something better comes along … How long can Ken Armstrong and his team survive against the infamous German Messerschmitts?